`emailrelay-set-envelope-from.js <emailrelay-set-envelope-from.js>`_
--------------------------------------------------------------------

.. code:: javascript

    //
    // SPDX-FileCopyrightText: 2026 Graeme Walker <graeme_walker@users.sourceforge.net>
    // SPDX-License-Identifier: FSFAP
    // 
    // Copyright (c) 2026 Graeme Walker <graeme_walker@users.sourceforge.net>
    // 
    // Copying and distribution of this file, with or without modification,
    // are permitted in any medium without royalty provided the copyright
    // notice and this notice are preserved.  This file is offered as-is,
    // without any warranty.
    // ===
    //
    // emailrelay-set-envelope-from.js
    //
    // An example E-MailRelay filter script for Windows that
    // sets the message's envelope "from" field to a fixed
    // value.
    //
    try
    {
    	var new_from = 'noreply@example.com' ;
    
    	// parse the command-line to get the envelope filename
    	var content = WScript.Arguments(0) ;
    	var envelope = WScript.Arguments(1) ;
    
    	// open the envelope file
    	var fs = WScript.CreateObject( "Scripting.FileSystemObject" ) ;
    	var ts = fs.OpenTextFile( envelope , 1 , false ) ;
    
    	// read the contents of the envelope file
    	var txt = ts.ReadAll() ;
    	ts.Close() ;
    
    	// update the from address
    	var re = new RegExp( "X-MailRelay-From: *\\S*" ) ;
    	txt = txt.replace( re , "X-MailRelay-From: " + new_from ) ;
    
    	// write the envelope file back out
    	ts = fs.OpenTextFile( envelope , 2 , false ) ;
    	ts.Write( txt ) ;
    	ts.Close() ;
    
    	// successful exit
    	WScript.Quit( 0 ) ;
    }
    catch( e )
    {
    	// report errors using the special <<...>> markers
    	WScript.StdOut.WriteLine( "<<edit failed>>" ) ;
    	WScript.StdOut.WriteLine( "<<" + e.name + ": " + e.message + ">>" ) ;
    	WScript.Quit( 1 ) ;
    }

.. _../examples/emailrelay-set-envelope-from.js: emailrelay-set-envelope-from_js.html